Memory презентация

RAM
It is a volatile memory which means the data stored in the RAM evaporates the moment you cut the power supply. That’s one of the reasons we can’t use random access memory as permanent storage despite the fact that it’s way faster than the traditional magnetic disk-based hard drives.
All of the modern operating systems we use have built-in workarounds to handle RAM’s volatile nature. All the work done is constantly saved on the hard drive to avoid situations where unexpected system shutdown would result in data loss.

ROM
The ROM is a non-volatile memory; it doesn’t forget the data even if the power supply is removed. ROM is used to store firmware for the hardware which hardly gets any update, for instance, the BIOS

Differences

Virtual memory
Virtual memory is an abstraction of the main memory. It extends the available memory of the computer by storing the inactive parts of the content RAM on a disk. It fetches it back to the RAM when the content is required.

Cache memory
Cache memory is used to store frequently accessed data in order to quickly access the data whenever it is required. They both are conceptually the same; however they mainly differ in the matter of implementation.